Hygrometer attachment.



No. 801.074. PATENTED OCT. 3. 1905.

J. H. GERBER.

HYGROMETER ATTACHMENT.

PPPPP UATIQN FILED JAN- 20, 1905 WITNESSES: I/VI/Efl/TOR 176% ]i Gcrren if Y ATTORNEYS.

UNITED STATES PATENT OFFICE.

HYGROIVIETER ATTACHMENT.

Specification of Letters Patent.

Patented Oct. 3, 1905.

Application filed January 20, 1905. Serial No. 241,966.

To roll whom it may concern:-

Be it known that I, J on): H. GERRER, a citizen of the United States, residing at Elreno, in the county of Canadian, Oklahoma Territory, have invented a new and useful Improvement in Hygrometer Attachments, of which the following is a specification.

The object of this invention is to provide a hygrometer attachment to be applied to glass inclosures in such a way as to indicate the degree of moisture inside the inclosure without having to open the inclosure-that is to say, the hygrometer is so formed as to be attached directly to the inside surface of the glass and to show the hygrometric scale through the glassso that it may be conveniently read from outside of the case or inclosu re and without taking up any valuable space within the case.

The invention is designed to be applied more especially to cigar-cases for indicating the degree of moisture or dryness within the case, so that the cigars may be kept at a uniform degree of moisture without drying out and deteriorating. It is also applicable to various other uses. Thus, for instance, it may be applied to the interior surface of the glass window of an incubator, a hothouse, or in any other situation where it is desirable to know and to regulate the degree of moisture.

The present invention is an improvement upon the hygrometer attachment shown and described in the Patent No. 780,791, granted January 24:, 1905, in which aspirally-twisted cord fixed at one end and bearing an indexhand at the other is made to turn from the absorption of moisture and deflect the indexhand over a graduated scale.

The improvement consists in the means for holding and adjusting the twisted cord, as hereinafter described.

Figure 1 is a face view of the hygrometer attachment shown applied to the interior surface of the glass top of a cigar-case, and Fig. 2 is a central section through the same on line 2 2 of Fig. l.

A is a dial formed of a plate of any suitable material in dished form-that is to say, the central portions (0 are offset from the marginal portion a, which latter is formed as a flat-faced annular rim or flange adapted to snugly fit against the flat surface of the glass plate inside the case. This flange is designed to be stuck to the glass by any suitable cement, preferably of waterproof character. On the face of the dished portion a is a graduated scale a whose opposite ranges indicate moist or dry. In the center of the dial is formed a hole, and around the hole there is attached a concentric foraminated cone C, which is made either of perforated metal, as shown, or any suitable material, so as to let the moisture of the air penetrate to the interior thereof. To the free end or apex of the cone there is firmly attached one end of a gut cord 6, which is formed by spiral windings of the gut filaments. The other end of this twisted gut cord is extended through the central hole of the dial and is firmly attached to an index-hand B. The more or less stifl and twisted gut cord forms an axial shaft for the index-hand with which the said hand may rotate as the twisted gut cord turns in one direction or the other as moisture is absorbed by or evaporated from the same.

The rotation of the twisted gut cord is effected according to well-known principles of all spirally-twisted cords to rotate as moisture is absorbed or evaporated, being due to the thickening of the twisted filaments as they expand from. the absorption of moisture, which gives a corresponding rotation of the cord about its longitudinal axis.

The cone O not only holds the twisted cord at one end, but protects it from injury.

To give rotary and longitudinal adjustment to the twisted cord and index-hand, the outer end of the cord is fixed to a screw I), which meshes with an internally screw threaded sleeve 6 fixed to the apex of the cone.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

A hygrometer made of a dished plate bearing readings, an index-hand arranged in the dished portion of the plate, a twisted absorbent cord fixed at one end to the index-hand, a foraminated cone having its base secured to the-back of the dished plate in concentric relation to the cord and having a screw in its outer end forming a connection for the cord substantially as described.

JOHN H. GERRER.

TVitnesses:

EARL BEEBE, PATRICK J. KELLY. 

